Luigi Villari, 1911 Encyclopædia Britannica, Volume 6… (1911)
“ The third, or Colonna-Romano line, is descended from Federigo Colonna (1223) . In the 12th century we find the Colonna as counts of Tusculum, and the family was then famous as one of the most powerful and turbulent of the great Roman clans; its feuds with the Orsini and the Gaetani are a characteristic feature of medieval Rome and the Campagna; like the other great nobles of the Campagna the Colonna plundered travellers and cities, and did not even spare the pope himself if they felt themselves injured by him. ”
